purpose

create 3 partitions of 8Go for :

• /var/www
• /mnt/gitea
• /var/lib/postgresql/

Create 3 partitions on the USB drive of 8Go

root@raspberrypi:~# fdisk /dev/sda

=>

Command (m for help): o
Created a new DOS disklabel with disk identifier 0x78494e0c.

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-60063743, default 2048): 
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-60063743, default 60063743): +8G

Created a new partition 1 of type 'Linux' and of size 8 GiB.

Command (m for help): n
Partition type
   p   primary (1 primary, 0 extended, 3 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2): 2
First sector (16779264-60063743, default 16779264): 
Last sector, +/-sectors or +/-size{K,M,G,T,P} (16779264-60063743, default 60063743): +8G

Created a new partition 2 of type 'Linux' and of size 8 GiB.

Command (m for help): n
Partition type
   p   primary (2 primary, 0 extended, 2 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (3,4, default 3): 
First sector (33556480-60063743, default 33556480): 
Last sector, +/-sectors or +/-size{K,M,G,T,P} (33556480-60063743, default 60063743): +8G

Created a new partition 3 of type 'Linux' and of size 8 GiB.

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

Check

root@raspberrypi:~# fdisk -l /dev/sda

=>

Disk /dev/sda: 28.7 GiB, 30752636928 bytes, 60063744 sectors
Disk model: Ultra           
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x78494e0c

Device     Boot    Start      End  Sectors Size Id Type
/dev/sda1           2048 16779263 16777216   8G 83 Linux
/dev/sda2       16779264 33556479 16777216   8G 83 Linux
/dev/sda3       33556480 50333695 16777216   8G 83 Linux

create ext4 filesystem for each partitions with explicit labels

mkfs.ext4 -L pi-git /dev/sda1
mkfs.ext4 -L pi-web /dev/sda2
mkfs.ext4 -L pi-pgsql /dev/sda3

Check

root@raspberrypi:~# ls -l /dev/disk/by-label/

=>

total 0
lrwxrwxrwx 1 root root 15 Apr 28 18:17 boot -> ../../mmcblk0p1
lrwxrwxrwx 1 root root 10 Apr 29 11:02 pi-git -> ../../sda1
lrwxrwxrwx 1 root root 10 Apr 29 11:05 pi-pgsql -> ../../sda3
lrwxrwxrwx 1 root root 10 Apr 29 11:05 pi-web -> ../../sda2
lrwxrwxrwx 1 root root 15 Apr 28 18:17 rootfs -> ../../mmcblk0p2

Mount

mkdir -p /var/www
mkdir -p /mnt/gitea
mkdir -p /var/lib/postgresql/

add to `/etc/fstab. see fstab resource:

LABEL=pi-git  /mnt/gitea                ext4    defaults  0       2
LABEL=pi-web  /var/www                  ext4    defaults  0       2
LABEL=pi-pgsql  /var/lib/postgresql         ext4    defaults  0       2

mount:

mount -a

check:

root@raspberrypi:~#  df -h

=>

Filesystem      Size  Used Avail Use% Mounted on
/dev/root        15G  1.3G   13G  10% /
devtmpfs        459M     0  459M   0% /dev
tmpfs           464M     0  464M   0% /dev/shm
tmpfs           464M  6.3M  457M   2% /run
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           464M     0  464M   0% /sys/fs/cgroup
/dev/mmcblk0p1  253M   53M  200M  21% /boot
tmpfs            93M     0   93M   0% /run/user/1000
/dev/sda1       7.9G   36M  7.4G   1% /mnt/gitea
/dev/sda2       7.9G   36M  7.4G   1% /var/www
/dev/sda3       7.9G   36M  7.4G   1% /var/lib/postgresql